单项选择题

They will do () they can to overcome () great difficulties there may be.

A．that; whatever
B．what; whatever
C．what; which
D．which; what

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单项选择题
This device will help the () detectives see things that may remain ().

A．advanced; hidden
B．advancing; hiding
C．advanced; hiding
D．advancing; hidden
单项选择题
The president's visit to Japan had a positive effect () business () science and technology between the two countries.

A．on; as well as
B．to; as well
C．about; as well
D．in; as well as
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